To send an email while on the go. Just open up Email 'n Walk,
and enter the subject and message text while a transparent view shows you the world around you.
via your iPhone's camera. Then hit "send" to send the message to the iPhone mail app,
pick your recipients, and send away.

If I were a paying customer, I would expect the author to write support for other messaging apps. Heck, how about doing that and giving the email orr text-only version away for free as a trial for the full-featured app?